/Engine/Source/Runtime/InteractiveToolsFramework/Public/InteractiveToolManager.h
FBeginToolChangeis used byUInteractiveToolManagerto back out of a Tool on Undo. No action is taken on Redo, ie we do not re-start the Tool on Redo.
class FBeginToolChange : public [FToolCommandChange](API\Runtime\InteractiveToolsFramework\FToolCommandChange)